.connect cannot be handled since the driver scans
and connects on its own. It is up to the driver
then to refuse a connection (with -EBUSY for
example).
Non-fixed channel IBSSes always take a single
channel resource. For example two non-fixed
channel IBSSes always take up 2
num_different_channels, even if they operate on
the same channel at a given point of time.
Signed-off-by: Michal Kazior <michal.kazior@xxxxxxxxx>
---
net/wireless/core.h | 27 ++++++++++++++++--
net/wireless/util.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++---
2 files changed, 92 insertions(+), 8 deletions(-)
diff --git a/net/wireless/core.h b/net/wireless/core.h
index 9d9441d..17da8f0 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -454,9 +454,20 @@ int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
u32 *flags, struct vif_params *params);
void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev);
-int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
- struct wireless_dev *wdev,
- enum nl80211_iftype iftype);
+int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
+ struct wireless_dev *wdev,
+ enum nl80211_iftype iftype,
+ struct ieee80211_channel *chan,
+ enum cfg80211_chan_mode chanmode);
+
+static inline int
+cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
+ struct wireless_dev *wdev,
+ enum nl80211_iftype iftype)
+{
+ return cfg80211_can_use_iftype_chan(rdev, wdev, iftype, NULL,
+ CHAN_MODE_UNDEFINED);
+}
static inline int
cfg80211_can_add_interface(struct cfg80211_registered_device *rdev,
@@ -465,6 +476,16 @@ cfg80211_can_add_interface(struct cfg80211_registered_device *rdev,
return cfg80211_can_change_interface(rdev, NULL, iftype);
}
+static inline int
+cfg80211_can_use_chan(struct cfg80211_registered_device *rdev,
+ struct wireless_dev *wdev,
+ struct ieee80211_channel *chan,
+ enum cfg80211_chan_mode chanmode)
+{
+ return cfg80211_can_use_iftype_chan(rdev, wdev, wdev->iftype,
+ chan, chanmode);
+}
+
void
cfg80211_get_chan_state(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev,
diff --git a/net/wireless/util.c b/net/wireless/util.c
index 9b92ec5..d40f324 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -938,13 +938,20 @@ int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
return res;
}
-int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
- struct wireless_dev *wdev,
- enum nl80211_iftype iftype)
+int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
+ struct wireless_dev *wdev,
+ enum nl80211_iftype iftype,
+ struct ieee80211_channel *chan,
+ enum cfg80211_chan_mode chanmode)
{
struct wireless_dev *wdev_iter;
u32 used_iftypes = BIT(iftype);
int num[NUM_NL80211_IFTYPES];
+ struct ieee80211_channel **used_channels;
+ struct ieee80211_channel *ch;
+ enum cfg80211_chan_mode chmode;
+ int num_different_channels = 0;
+ int num_max_channels = 0;
int total = 1;
int i, j;
@@ -954,6 +961,33 @@ int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
if (rdev->wiphy.software_iftypes & BIT(iftype))
return 0;
+ for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
+ if (!rdev->wiphy.bands[i])
+ continue;
+
+ num_max_channels += rdev->wiphy.bands[i]->n_channels;
+ }
+ if (!num_max_channels)
+ return -EINVAL;
+
+ used_channels = kzalloc(num_max_channels * sizeof(*used_channels),
+ GFP_KERNEL);
+ if (!used_channels)
+ return -ENOMEM;
+
+ switch (chanmode) {
+ case CHAN_MODE_UNDEFINED:
+ break;
+ case CHAN_MODE_SHARED:
+ WARN_ON(!chan);
+ used_channels[0] = chan;
+ num_different_channels++;
+ break;
+ case CHAN_MODE_EXCLUSIVE:
+ num_different_channels++;
+ break;
+ }
+
memset(num, 0, sizeof(num));
num[iftype] = 1;
@@ -968,11 +1002,37 @@ int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
continue;
+ cfg80211_get_chan_state(rdev, wdev_iter, &ch, &chmode);
+
+ switch (chmode) {
+ case CHAN_MODE_UNDEFINED:
+ break;
+ case CHAN_MODE_SHARED:
+ for (i = 0; i < num_max_channels; i++)
+ if (!used_channels[i] || used_channels[i] == ch)
+ break;
+
+ if (i == num_max_channels) {
+ kfree(used_channels);
+ return -ENOMEM;
+ }
+
+ if (used_channels[i] == NULL) {
+ used_channels[i] = ch;
+ num_different_channels++;
+ }
+ break;
+ case CHAN_MODE_EXCLUSIVE:
+ num_different_channels++;
+ break;
+ }
+
num[wdev_iter->iftype]++;
total++;
used_iftypes |= BIT(wdev_iter->iftype);
}
mutex_unlock(&rdev->devlist_mtx);
+ kfree(used_channels);
if (total == 1)
return 0;
@@ -984,12 +1044,15 @@ int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
c = &rdev->wiphy.iface_combinations[i];
+ if (total > c->max_interfaces)
+ continue;
+ if (num_different_channels > c->num_different_channels)
+ continue;
+
limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
GFP_KERNEL);
if (!limits)
return -ENOMEM;
- if (total > c->max_interfaces)
- goto cont;
for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
if (rdev->wiphy.software_iftypes & BIT(iftype))
--
1.7.0.4
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